This is so funny!
If you didn’t already know, the four Gospels are traditionally represented by the “four living creatures” in the Old Testament book of Ezekiel. Matthew is represented by a man, Mark by a lion, Luke by a calf, and John by an eagle. As a result, when you see paintings of these saints, you’ll often see their corresponding animal in there somewhere, too.
Apparently medieval European Catholic artists hadn’t seen too many lions, or at least hadn’t figured out how to paint one yet!
She wrote: “If you’re having a bad day, please appreciate these artists’ attempts to draw lions with St. Mark“.